Install uBlock Origin addon for firefox - https://addons.mozilla.org/ru/firefox/addon/ublock-origin
Original releases https://github.com/gorhill/uBlock/releases

Also you may install Adblock Plus https://adblockplus.org
https://update.adblockplus.org/latest/adblockplusfirefox.xpi

ConfigFox-1.4.3-x32 is a tool for config Firefox privacy and settings.
You may use it or not. Just copy "user.js" in Firefox preferences folder.

Go to C:\Users\%USERNAME%\AppData\Roaming\Mozilla\Firefox\Profiles\
There is only one subfolder, it has unique name, open it and copy "user.js"